
/*
 * Copyright (c) 2007 Intel Corporation. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include "display_common.h"
#include "object_heap.h"

#include "assert.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define ASSERT	assert

#define LAST_FREE	-1
#define ALLOCATED	-2

/*
 * Expands the heap
 * Return 0 on success, -1 on error
 */
static int object_heap_expand(object_heap_p heap)
{
	int i;

	void *new_heap_index;

	int next_free;

	int new_heap_size = heap->heap_size + heap->heap_increment;

	new_heap_index = (void *) realloc(heap->heap_index, new_heap_size * heap->object_size);
	if (NULL == new_heap_index)
	{
		return -1;				/* Out of memory */
	}
	heap->heap_index = new_heap_index;
	next_free = heap->next_free;
	for (i = new_heap_size; i-- > heap->heap_size;)
	{
		object_base_p obj = (object_base_p) (heap->heap_index + i * heap->object_size);

		obj->id = i + heap->id_offset;
		obj->next_free = next_free;
		next_free = i;
	}
	heap->next_free = next_free;
	heap->heap_size = new_heap_size;
	return 0;					/* Success */
}

/*
 * Return 0 on success, -1 on error
 */
int object_heap_init(object_heap_p heap, int object_size, int id_offset)
{
	heap->object_size = object_size;
	heap->id_offset = id_offset & OBJECT_HEAP_OFFSET_MASK;
	heap->heap_size = 0;
	heap->heap_increment = 16;
	heap->heap_index = NULL;
	heap->next_free = LAST_FREE;
	_i965InitMutex(&heap->mutex);
	return object_heap_expand(heap);
}

/*
 * Allocates an object
 * Returns the object ID on success, returns -1 on error
 */
int object_heap_allocate(object_heap_p heap)
{
	object_base_p obj;

	_i965LockMutex(&heap->mutex);
	if (LAST_FREE == heap->next_free)
	{
		if (-1 == object_heap_expand(heap))
		{
			_i965UnlockMutex(&heap->mutex);
			return -1;			/* Out of memory */
		}
	}
	ASSERT(heap->next_free >= 0);

	obj = (object_base_p) (heap->heap_index + heap->next_free * heap->object_size);
	heap->next_free = obj->next_free;
	_i965UnlockMutex(&heap->mutex);

	obj->next_free = ALLOCATED;
	return obj->id;
}

/*
 * Lookup an object by object ID
 * Returns a pointer to the object on success, returns NULL on error
 */
object_base_p object_heap_lookup(object_heap_p heap, int id)
{
	object_base_p obj;

	_i965LockMutex(&heap->mutex);
	if ((id < heap->id_offset) || (id > (heap->heap_size + heap->id_offset)))
	{
		_i965UnlockMutex(&heap->mutex);
		return NULL;
	}
	id &= OBJECT_HEAP_ID_MASK;
	obj = (object_base_p) (heap->heap_index + id * heap->object_size);
	_i965UnlockMutex(&heap->mutex);

	/* Check if the object has in fact been allocated */
	if (obj->next_free != ALLOCATED)
	{
		return NULL;
	}
	return obj;
}

/*
 * Iterate over all objects in the heap.
 * Returns a pointer to the first object on the heap, returns NULL if heap is empty.
 */
object_base_p object_heap_first(object_heap_p heap, object_heap_iterator * iter)
{
	*iter = -1;
	return object_heap_next(heap, iter);
}

/*
 * Iterate over all objects in the heap.
 * Returns a pointer to the next object on the heap, returns NULL if heap is empty.
 */
object_base_p object_heap_next(object_heap_p heap, object_heap_iterator * iter)
{
	object_base_p obj;

	int i = *iter + 1;

	_i965LockMutex(&heap->mutex);
	while (i < heap->heap_size)
	{
		obj = (object_base_p) (heap->heap_index + i * heap->object_size);
		if (obj->next_free == ALLOCATED)
		{
			_i965UnlockMutex(&heap->mutex);
			*iter = i;
			return obj;
		}
		i++;
	}
	_i965UnlockMutex(&heap->mutex);
	*iter = i;
	return NULL;
}

/*
 * Frees an object
 */
void object_heap_free(object_heap_p heap, object_base_p obj)
{
	/* Don't complain about NULL pointers */
	if (NULL != obj)
	{
		/* Check if the object has in fact been allocated */
		ASSERT(obj->next_free == ALLOCATED);

		_i965LockMutex(&heap->mutex);
		obj->next_free = heap->next_free;
		heap->next_free = obj->id & OBJECT_HEAP_ID_MASK;
		_i965UnlockMutex(&heap->mutex);
	}
}

/*
 * Destroys a heap, the heap must be empty.
 */
void object_heap_destroy(object_heap_p heap)
{
	object_base_p obj;

	int i;

	_i965DestroyMutex(&heap->mutex);

	/* Check if heap is empty */
	for (i = 0; i < heap->heap_size; i++)
	{
		/* Check if object is not still allocated */
		obj = (object_base_p) (heap->heap_index + i * heap->object_size);
		ASSERT(obj->next_free != ALLOCATED);
	}
	free(heap->heap_index);
	heap->heap_size = 0;
	heap->heap_index = NULL;
	heap->next_free = LAST_FREE;
}

void
i965_check_alloc_surface_bo(VADriverContextP ctx,
							struct object_surface *obj_surface, int tiled, unsigned int fourcc)
{
	struct i965_driver_data *i965 = i965_driver_data(ctx);

	if (obj_surface->bo)
		return;

	if (tiled)
	{
		uint32_t tiling_mode = I915_TILING_Y;	/* always uses Y-tiled format */

		unsigned long pitch;

		obj_surface->bo =
			drm_intel_bo_alloc_tiled(i965->intel.bufmgr,
									 "vaapi surface",
									 obj_surface->width,
									 obj_surface->height +
									 obj_surface->height / 2, 1, &tiling_mode, &pitch, 0);
		assert(tiling_mode == I915_TILING_Y);
		assert(pitch == obj_surface->width);
	}
	else
	{
		obj_surface->bo = dri_bo_alloc(i965->intel.bufmgr,
									   "vaapi surface", obj_surface->size, 0x1000);
	}

	obj_surface->fourcc = fourcc;
	assert(obj_surface->bo);
}
